Export Database table to Excel with auto serial number using C# in ASP.Net

HI! I have table inform, but I want export data from database by using below code. It’s worked and I have some problem. I want new id in excel by order. In below code it’s not show new id.

            using (SqlConnection con = new SqlConnection(UserData))
            {
                SqlCommand cmd = con.CreateCommand();
                string sql = @"SELECT row_number() over(order by ID) AS NID, LastName, Name, Birthday, Address FROM Inform ORDER BY NID";
                cmd.CommandText = sql;
                con.Open();
                SqlDataAdapter sda = new SqlDataAdapter();
                try
                {
                    sda.SelectCommand = cmd;
                    DataTable dt = new DataTable();
                    sda.Fill(dt);

                    if (dt.Rows.Count > 0)
                    {
                        string path = Server.MapPath("exportedfiles\\");

                        if (!Directory.Exists(path))
                        {
                            Directory.CreateDirectory(path);
                        }

                        File.Delete(path + "MutilationSheet.xlsx");


                        Excel.Application xlAppToExport = new Excel.Application();
                        xlAppToExport.Workbooks.Add("");


                        Excel.Worksheet xlWorkSheetToExport = default(Excel.Worksheet);
                        xlWorkSheetToExport = (Excel.Worksheet)xlAppToExport.Sheets["Лист1"];


                        int iRowCnt = 4;


                        xlWorkSheetToExport.Cells[1, 1] = "Inform about mutilation";

                        Excel.Range range = xlWorkSheetToExport.Cells[1, 1] as Excel.Range;
                        range.EntireRow.Font.Name = "Palatino Linotype";
                        range.EntireRow.Font.Bold = true;
                        range.EntireRow.Font.Size = 20;

                        xlWorkSheetToExport.Range["A1:E1"].MergeCells = true;

                        xlWorkSheetToExport.Cells[iRowCnt - 1, 1] = "NID";
                        xlWorkSheetToExport.Cells[iRowCnt - 1, 2] = "LastName";
                        xlWorkSheetToExport.Cells[iRowCnt - 1, 3] = "Name";
                        xlWorkSheetToExport.Cells[iRowCnt - 1, 4] = "Birthday";
                        xlWorkSheetToExport.Cells[iRowCnt - 1, 5] = "Address";

                        int i;
                        for (i = 0; i <= dt.Rows.Count - 1; i++)
                        {
                            xlWorkSheetToExport.Cells[iRowCnt, 1] = dt.Rows[i].Field<Int32>("NID");
                            xlWorkSheetToExport.Cells[iRowCnt, 2] = dt.Rows[i].Field<string>("LastName");
                            xlWorkSheetToExport.Cells[iRowCnt, 3] = dt.Rows[i].Field<string>("Name");
                            xlWorkSheetToExport.Cells[iRowCnt, 4] = dt.Rows[i].Field<string>("Birthday");
                            xlWorkSheetToExport.Cells[iRowCnt, 5] = dt.Rows[i].Field<string>("Address");
                            iRowCnt = iRowCnt + 1;
                        }


                        Excel.Range range1 = xlAppToExport.ActiveCell.Worksheet.Cells[11, 1] as Excel.Range;
                        range1.AutoFormat();

                        xlWorkSheetToExport.SaveAs(path + "MutilationSheet.xlsx");


                        xlAppToExport.Workbooks.Close();
                        xlAppToExport.Quit();
                        xlAppToExport = null;
                        xlWorkSheetToExport = null;

                        lblConfirm.Text = "Data Exported Successfully";
                        lblConfirm.Attributes.Add("style", "color:green; font: normal 14px Palatino Linotype;");
                        btView.Attributes.Add("style", "display:block");
                        btDownLoadFile.Attributes.Add("style", "display:block");
                    }
                }
                catch (Exception ex)
                {
                    lblConfirm.Text = ex.Message.ToString();
                    lblConfirm.Attributes.Add("style", "color:red; font: bold 14px/16px Palatino Linotype");
                }
                finally
                {
                    sda.Dispose();
                    sda = null;
                    con.Close();
                }
            }